Sharpener for rotary blades.



J. M. PETERSON.

SHARPENER FOR ROTARY BLADES.

APPLICATION FILED FEB. 19. 1915.

1,165,342. Patented Dec. 21, 1915.

H 7 uv 3 s'rArEs PATENT FFQE.

JOHN M. PETERSON, OF CHICAGO, ILLINOIS, ASSIG-NOR TO'GEORG'E J. SAVER,OF CHICAGO, ILLINOIS.

SHARPENER FOR ROTARY BLADES.

Specification of Letters Patent.

, Patented Dec. 21, 1915.

Application filed February 19, 1915. Serial No. 9,235.

To all whom it may concern:

Be it known that 1, JOHN M. Pn'rEnsoN,

a citizen of the United States, residing at Chicago, in the county ofCook and State of Illinois, have invented a certain new and usefulImprovement in Sharpeners for R0- tary Blades, of which the following isa full, clear, concise, and exact description, reference being had tothe accompanying drawings, forming a part of this specification.

- My invention relates to sharpeners for rotary blades and is moreparticularly applicable to meat slicing machinery for instance where alarge rotary circular blade is used to cut the meat into slices, whichrotary blade must be periodically sharpened.

My invention has for its object the provision of grinding or sharpeningmechanism for the blade, which mechanism is arranged close to the l'mifeso that merely a slight movement of a fingerhold is necessary to placethe sharpeners into condition to perform their work. The device is alsomore particularly designed to provide an extremely simple constructionas I have found that by reducing the number of movements heretofore usedI can construct such a device having a minimum number of parts.

My invention contemplates the provision of two sharpeners, one for theback of the knife and the other for the face of the knife arranged upona swinging frame in such a manner that when the frame is swung thesharpeners are in engagement with the blade and when the frame is swungin the opposite direction the sharpeners are away from the blade."Merely a rotary movement is necessary to carry out allof the steps necessary to place the sharpeners into sharpening position or remove themtherefrom.

I will explain one form which my invention may take by referring to theaccompanying drawing in which Figure 1 is a diagrammatic view of aslicing machine showing a side view of my improved sharpening device;Fig. 2 is a top view of the sharpening device; Fig. 3 is a sectionalview on line a'a of Fig. 1; Fig. 4 is a sectional view on line 5-?) ofFig. 3, and Fig. 5 is a sectional view on line c0 of Fig. 4:. V

The rotary blade 1 is carried by the shaft 2 which is supported in thebearing 3. A foot 4: is mounted upon the bearing 3 and supportspreferably a spindle 5 to which a carries a framework 9.

can be used as is readily apparent.

sleeve 6 is fixedly secured by the set screw 7 By referring moreparticularly to Fig. 3, it will be seen that the sleeve 6 can be setrelative to the spindle 5 and then fastened so as to make the initialadjustment of the device relative to the blade 1. The sleeve 6 car riesa rotatably mounted spindle 8 which The spindle 8 as stated is rotatablymounted in the sleeve 6 and may be rotated by the fingerhold 10 which bymeans of its stem 11 is fixedly se cured to the spindle 8. Thefingerhold projects out through a hollow casing 12 having at its outerextremity as seen more clearly in Figs. 4 and 5 an opening 13 soarranged that the stem 11 occupies either an alternate position to theright (Fig. 5) or an alternate position to the left and never occupiespermanently the intermediate position in which it is shown in Figs. 1and 5. A spring 1 1 normally pushes the spindle 8 upwardly so that thestem 11 is held out of the'two depressions forming part of the opening13. It will thus be seen that the framework 9 can be rotated within thelimits of movement permitted the spindle 11, the spring 14: alwaysforcing the spindle into one or the other of its limiting positions. Ofcourse no up or down movement of the framework need take place becausethe depressions of the opening 13 can be exceedingly slight or in factother means for locking the stem 11 The framework 9 as stated carries apair of sharpening devices 15 and 16 for the opposite faces of theknife. A hood 17 is also provided preferably to cover the said grindingdevices. The grinding devices are rotatably mounted respectively onshafts 18 and 19 pivotally mounted in the sleeves or hubs 20, 21.Suitable springs 22 and 23 shown in dotted lines in Fig. 2 normallyserve to equalize the pressure of the sharpening devices against theknife surface. Now whenever the fingerhold 10 is moved into one limitingposition the sharpening devices 15 and 16 are away from the knife andwhenever it is swung into its other limiting position the two grindingdevices which are on opposite sides of the knife are swung against theknife (on opposite sides thereof).

, It will thus be seen that an exceedingly simple device is hereprovided for sharpening purposes for rotary blades which controls theposition of the sharpening devices when against the blade and alsocontrols and locks them out of operative positionwhen their use is notdesired. Of course, a wider latitude of movement to the'stem 11 may beprovided if the sharpeners are to be moved a greater distance away fromthe knife when in their inoperative position. This may be foundnecessary should the machine be used for cutting meat of such acharacter that particles thereof adhere to the surface of the knife inits rotary movement, it not being desirable that this adhering meat engage the sharpening devices.

From what has been described the nature of my invention will be clearfrom the one form illustrated herein.

-What I therefore claim as new and desire to secure by Letters Patentis: v 1. A device for sharpening the rotary circular knives of meatslicing machines, comprising a rotatable framework, a pair of sharpeningdevices mounted upon said framework, a fingerhold for rotating saidframework substantially in a horizontal frame to bring the sharpeningdevices into or out of engagement with the said knife, and means forlocking said framework in both of its limiting positions.

2. A device for sharpening the rotary circular knives of meat slicingmachines, comprising a rotatable framework, a pair of sharpening devicesmounted upon said framework so as to be upon opposite sides of saidknifejmeans for rotating said frame- 'work substantially in a plane tobring said sharpening devices into engagement with the said knife, andmeans for locking said framework in its limiting position.

3. A device for sharpening the rotary circular knives of meat slicingmachines comprising a rotatable framework having a spindle, asleevewithin which said spindle is rotatably mounted, a fingerhold forrotating said spindle, means associated with said sleeve for lockingsaid fingerhold in its limiting positions, and a pair of sharpeningdevices respectively on opposite sides of said knife. mounted uponsaidframework.

l. A device for sharpening the rotary circular-knives of meat slicingmachines comprising a rotatable framework having a spindle, a sleevewithin which said spindle is rotatably mounted, a fingerhold forrotating said spindle, means associated with said sleeve for lockingsaid fingerhold in its limiting positions, a pair of sharpening devicesrespectively on opposite sides-of said knife mounted upon saidframework, and a spring acting against said spindle.

In witness whereof, I hereunto subscribe my name this thirteenth day ofFebruary A. D. 1915. l V JOHN M. PETERSON. 1 Witnesses: p

WM. ALCHAPIN, JOHN VVYMOND.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. G. 1" i It is hereby certified that the name of theassignee in Letters Patent No. 1, 165,342,

granted December 15, 1915, upon the application of John M. Peterson, ofChicago, Illinois, for an improvement in Sharpeners for Rotary Blades,was erroneously Written and printed as George J. Saver, Whereas saidname should have been Written and printed as George J. Sayer, as shownby the records of assignments in this office; and that the said LettersPatent should be read with this correction therein that the same mayconform to the record of the case in the Patent Office.

Signed and sealed this 15th day of February, A. D., 1916.

[SEAL] R. F. WHITEHEAD,

Acting Commissioner of Patents. 01. 51-7.

